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A
  1. cylindrical thalli, formed by free-living branchlets, simple or variously ramified;

  2. tetrasporangial conceptacles multiporate, sunken in the thallus.

tab. 9

Ramuli liberi
i
multipori
ii
B
  1. subspherical thalli, with sparse anastomosed adventitious lamellae of nearly equal height, forming globoid-shaped thalli;

  2. tetrasporangial conceptacles uniporate (columella frequently present (see c )), sunken in the thallus.

Lithophyllum dentatum

lamelle avventizie
i
unipori
ii

C
  1. subspherical thalli, with lumpy excrescences (sometimes variously ramified);

  2. tetrasporangial conceptacles uniporate or multiporate, more or less superficial.

    tab. 10


escrescenze bitorzolute
i

ii

D
  1. subspherical thalli with lumpy excrescences;
  2. tetrasporangial sori immersed in the thallus, visible as pores on thallus surface;  (NB: cruciate tetraspores);
  3. both secondary pit-connections and cell fusions present.

Sporolithon ptychoides


escrescenze bitorzolute
i


ii




iii
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